[oilpan] Implement accept methods to trace the class hierarchy of SVGElement and all sub-classes.

Source/core/svg/animation/SVGSMILElement.h

 /*
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 93 matching lines @@
     bool isFrozen() const;
 
     unsigned documentOrderIndex() const { return m_documentOrderIndex; }
     void setDocumentOrderIndex(unsigned index) { m_documentOrderIndex = index; }
 
     virtual bool isAdditive() const = 0;
     virtual void resetAnimatedType() = 0;
     virtual void clearAnimatedType(SVGElement* targetElement) = 0;
     virtual void applyResultsToTarget() = 0;
 
+    virtual void accept(Visitor* visitor) const OVERRIDE { SVGElement::accept(visitor); }
+
 protected:
     void addBeginTime(SMILTime eventTime, SMILTime endTime, SMILTimeWithOrigin::Origin = SMILTimeWithOrigin::ParserOrigin);
     void addEndTime(SMILTime eventTime, SMILTime endTime, SMILTimeWithOrigin::Origin = SMILTimeWithOrigin::ParserOrigin);
 
     void setInactive() { m_activeState = Inactive; }
 
     // Sub-classes may need to take action when the target is changed.
     virtual void setTargetElement(SVGElement*);
     virtual void setAttributeName(const QualifiedName&);
 
@@ skipping 108 matching lines @@
     mutable SMILTime m_cachedMin;
     mutable SMILTime m_cachedMax;
 
     friend class ConditionEventListener;
 };
 
 }
 
 #endif // ENABLE(SVG)
 #endif // SVGSMILElement_h